The tile you can see is not what keeps water out of your house. The felt or synthetic membrane under it does that job, and in Arizona heat that layer wears out decades before the tile does. This guide covers how to tell when yours is finished, what the work costs in Phoenix, and what a real estimate should spell out, drawn from our tile repair and replacement work across the Valley.
What's on This Page
Five Things That Decide Your Number
Two houses on the same street can get quotes $6,000 apart for the same job. Here is why.
ROOF SIZE AND SLOPE
HOW MUCH TILE SURVIVES
WHAT THE DECK LOOKS LIKE
WHICH UNDERLAYMENT YOU PICK
What Tile Roof Underlayment Replacement Costs in Phoenix
Published Arizona pricing guides put tile underlayment replacement at roughly $4 to $6 per square foot installed. That figure covers removing the old material, prepping the surface, and installing the new membrane. Larger and more complex Phoenix-area projects are quoted in the $11,000 to $22,000 range once roof size, pitch, and material are counted.
We quote every roof on its own instead of publishing a price per square, so treat these numbers as the market you are shopping in, not as our price list. Any contractor who gives you a firm total before looking at your deck is guessing.
Cost by Underlayment Type
This is the biggest decision you get to make, and the cheapest option is rarely the least expensive one over 20 years. Here is the Arizona market pricing by type, with the service life each one buys you.
Asphalt-Saturated Felt (30 lb, ASTM D226 Type II)
Roughly $2 to $3 per square foot, with a 10 to 15 year service life. Thirty pound felt that meets ASTM D226 Type II is the code minimum under tile. It is legal, it is cheap, and in Phoenix it is the wrong choice most of the time. Asphalt felt dries out, curls, and cracks under constant sun and heat, and the national lifespan estimates you will read do not hold here.
Synthetic Underlayment
Roughly $4 to $6 per square foot, with a 20 to 30 year service life. Synthetics are woven plastic rather than asphalt-soaked paper, so they do not dry out the way felt does, and they handle the daily heating and cooling a Phoenix deck goes through. For most tile roofs in the Valley it is the default, and it is what we specify unless there is a reason not to.
Peel-and-Stick (Self-Adhered) Membrane
Roughly $6 to $8 per square foot, with a 30 year plus service life. Self-adhered membrane bonds to the deck and seals around every fastener, which is what you want in a valley, at an eave, or on a low-slope section where wind-driven monsoon rain pushes water uphill. Plenty of roofs do best with synthetic across the main field and peel and stick in the trouble spots.
Cost by Roof Size
Here are worked totals, so you can find your roof on the list. These assume a straightforward single-story roof with most of the tile salvageable.
Around 1,500 Square Feet
$6,000 to $9,000. This covers a lot of the smaller ranch homes in the older Phoenix and Glendale neighborhoods.
Around 2,000 Square Feet
$8,000 to $12,000. This is the most commonly quoted size in the Valley and the number most homeowners end up comparing against.
Larger and Complex Roofs
$11,000 to $22,000 for typical larger Phoenix-area projects. Cut-up rooflines with a lot of hips, valleys, and dormers cost more per square foot than a simple gable roof of the same size, because every transition is hand work and every valley is a detail.
Signs Your Tile Roof Underlayment Is Failing
You cannot see underlayment without lifting tile, so the failures show up indirectly. Any one of these on its own might be something else. Three or four together usually means the membrane is done.
Does This Describe Your Roof?
How to Date Your Own Underlayment
You can get most of the way to an answer without a ladder. Find the year the house was built, then find out whether the roof has ever been redone. If the answer is no, your underlayment is as old as the house.
Then apply the Arizona number, not the national one. Asphalt felt is often rated for 20 to 30 years, but in Arizona that drops to roughly 15 to 20. Summer roof surface temperatures here run past 160 degrees, and constant heat plus sun is what breaks asphalt-soaked paper down. A house built in the late 1990s on 30 pound felt that has never been re-roofed is at the end of its underlayment life right now, whatever the tile looks like from the street.
This is also why tile roofs confuse people. Concrete and clay tile can go 50 years or more, so the visible part of the roof looks fine while the waterproofing under it has quietly expired. It is worth reading how a tile roof leaks alongside the bigger picture of how long a roof lasts in Arizona, because the two layers age on completely different clocks.
What Drives the Price Up or Down
The per-square-foot range is a starting point. Four things move a real quote inside it, and they are the same four things that make one estimate look suspiciously cheaper than another. The same logic applies to what roof repair costs in Arizona in general.
Tile Breakage and Replacement Tile
This is the biggest swing factor in any underlayment quote. Every tile comes off and goes back on, and some of it breaks in the process. On a well-maintained roof, most of the tile survives. On a 30 year old roof that has had foot traffic and no maintenance, a lot less does.
The tile profile matters too. Barrel tile, flat concrete tile, and clay all behave differently coming off, and a discontinued profile means sourcing salvaged tile or blending a close match on a less visible side of the roof. Ask what breakage rate the estimate assumed and what replacement tile costs if it runs higher.
Roof Deck Condition
Once the tile and the old felt are off, the roof deck is visible for the first time in decades. If the underlayment has been failing for a few seasons, there is usually some rot, typically at the eaves, in the valleys, and around pipes and vents where water sat longest. Damaged decking gets cut out and replaced before anything new goes down.
No estimate can price this exactly in advance. A good one states a per-sheet price for decking replacement up front, so it does not become a negotiation after the roof is open.
Pitch, Height, and Roof Complexity
Steep pitches need staging and slow the crew down. Two-story roofs add lifting and material handling. A roof with six valleys and three dormers costs more per square foot than a simple gable roof of the same size, because every transition is hand work.
Scope: Full Roof vs. Sections
Homeowners ask about doing half the roof all the time, and sometimes it is the right call. If one side is failing and the rest is a different age, a section makes sense. If the whole roof went on at once, doing half of it means paying the mobilization, staging, and tile-handling costs twice and ending up with two different expiration dates.
If your roof can get through another season, we will tell you that. What we will not do is take a partial job on a roof where the deck is already wet, because the damage grows faster than the savings.
How the Job Runs: Lift and Relay
Underlayment replacement on a tile roof is called a lift and relay, and it helps to know what you are watching. Crews of five to seven installers work with a dedicated Superintendent on every project, who introduces themselves before the work starts.
Lift and Relay, Step by Step
Lift and Stage the Tile
Strip and Inspect the Deck
Install New Underlayment
Relay the Tile and Clean Up
Why Tile Roofs Cost More Than a Membrane Swap
The material is not the expensive part. Labor is roughly 60 percent of a tile roof project, because the tile has to come off one piece at a time, be stored without more breakage, and go back down in the right rows. On a flat roof, the membrane is the job. On a tile roof, the tile handling is the job, and the membrane is a small part of the bill by comparison.
That is also why a bid far under the market range deserves a question. The usual explanations are a thinner underlayment than quoted, a breakage assumption that will not hold, or decking priced as a change order later.
What We Usually Find
The call almost never comes in as an underlayment question. It comes in as a ceiling stain in one bedroom after a monsoon storm, and the homeowner assumes a cracked tile. We lift a few tiles and find felt that has gone to powder across the whole side of the roof, not just above the stain. By the time water reaches drywall, the membrane has usually been failing for two or three seasons.
Permits, Code, and What Phoenix Requires
Permits are the thing most cost guides skip, and they change the timeline more than the price. Under Phoenix Building Construction Code Section 105.2.1, a reroof that uses the same type of material as the original and does not stack shingle layers does not need a permit on its own. A straight like-for-like underlayment replacement often falls inside that.
The exception is the one that applies to aging tile roofs. If sheathing or decking is being replaced, that is structural work, and both the City of Phoenix and Maricopa County require a permit for it. Since nobody knows the deck condition until the tile is off, the straight answer is that a permit may or may not be needed, and your contractor should tell you which rule applies and pull the permit if it does.
Code also governs what goes back down. Concrete and clay tile is allowed only over solid or spaced structural sheathing, only on slopes of two and a half units in twelve or steeper, with underlayment applied and fastened per the code tables. Thirty pound felt meeting ASTM D226 Type II is the minimum that satisfies it, and the minimum is not the same as the right choice in this climate.
Insurance, Warranties, and Paying for It
Three separate questions get tangled together here, so it is worth taking them one at a time.
Will Homeowners Insurance Cover It?
Usually not, and you should hear that plainly before you file anything. Underlayment that has reached the end of its service life is wear and tear, and wear and tear is not covered by any standard policy. Age is exactly what the insurer is looking for.
Storm damage is different. If monsoon wind or hail broke tile and drove water into the system, that may well be covered. Arizona's monsoon season runs June 15 through September 30, a fixed 108 day window the National Weather Service set in 2008, and claims cluster inside it. We attend adjuster appointments and handle the claim documentation when there is a real claim to make.
One thing that does not change whatever the outcome: your deductible is collected in full, as Arizona law requires. It is never waived, absorbed, or rebated by us or by anyone else, and a contractor who offers to cover it is telling you something useful about how they operate. You can finance a deductible. You cannot have it discounted.
What the Workmanship Warranty Covers
Our residential work carries a lifetime workmanship warranty, and the conditions matter as much as the headline. It covers labor on the installation, not materials, which stay under the manufacturer's own warranty. It sits behind that material warranty rather than replacing it. It requires a documented professional inspection and maintenance once a year, with dated invoices kept. It transfers once to a new owner with written notice within 30 days of the sale.
If a defect shows up, notify us within 30 days and let us inspect before any other repairs are made. The full picture is in our guide to roofing warranties in Arizona.
Financing the Work
This is a five-figure project for most homes, and it rarely arrives at a convenient moment. Financing runs through GoodLeap, LLC, a third-party lender, in 5, 7, and 10 year fixed terms at 12.99 percent APR with Autopay, or 13.49 percent without. There are no origination fees, no dealer fees, and no prepayment penalties. Prequalifying is a soft credit pull that does not affect your credit score. It can cover the whole project, including the part an insurance claim does not pay and including a deductible. More in our overview of roof financing options in Arizona.
Getting an Estimate You Can Compare
Three quotes for the same roof are only useful if they describe the same work. A real estimate lists the underlayment product by name and rating, the assumed tile breakage rate and the price of replacement tile, a per-sheet price for decking, whether flashing and valley metal are included, tear-off and disposal, and any permit. If a quote is one number on one line, you cannot compare it to anything.
Call the office and you will speak to a team member who schedules the inspection while you are on the phone, typically within 48 hours. We inspect the roof in person wherever possible and use a drone where it makes sense, and you can have a detailed inspection report, an estimate, or both. As a member of the Tile Roofing Industry Alliance, we build tile roofs to the standards that body publishes, not to whatever is cheapest that week.
Concrete Tile Roofing
Clay Tile Roofing
If you are not sure whether you need an estimate or just a look, start with an inspection. You can schedule a roof inspection and get a written read on the roof's condition without committing to any work. On cash-paying residential projects we typically finish within three weeks of signing. Insurance-funded work runs on the insurer's schedule, not ours, so we do not quote that timeline on a claim.